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FHLB Advances, Other Borrowings and Junior Subordinated Notes Subordinated notes payable and junior subordinated notes payable (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subordinated Borrowing [Line Items]      
Borrowed funds $ 308,977,000 $ 217,917,000  
Repayment of subordinated notes payable 0 7,875,000 $ 0
Unamortized Debt Issuance Cost, Subordinated Notes 321,000    
Subordinated Debt      
Subordinated Borrowing [Line Items]      
Borrowed funds 23,769,000 $ 23,713,000  
Maturity date September 21, 2024 | Subordinated Debt      
Subordinated Borrowing [Line Items]      
Borrowed funds $ 15,000,000    
Fixed rate 6.50%    
Maturity date April 15, 2027 | Subordinated Debt      
Subordinated Borrowing [Line Items]      
Borrowed funds $ 9,100,000    
Fixed rate 6.00%